Carbon bonded refractory brick composition

Abstract

A composition for molding refractory bricks having improved stability and load resistance in a furnace at elevated temperatures includes between 50 to 97 percent by weight of a pulverulent sized refractory material and between 3 to 27 percent by weight carbon. The carbon in the composition before curing at elevated temperatures includes a liquid carbonaceous bonding resin which improves the moldability of the composition before curing and provides high strength and rigidity to the brick after curing at elevated temperatures.

I claim: 
     
       1. A moldable refractory composition for making a compact shaped body which includes about 75 percent by weight periclase with about 34 percent of said periclase having a size which passes through a 4 mesh Tyler Standard Screen and is retained on a 10 mesh screen, about 28 percent by weight having a size which passes through a 10 mesh screen and is retained on a 35 mesh screen, about 14 percent by weight having a size which passes through a 35 mesh screen and about 34 percent by weight having a size which passes through a 150 mesh screen and about 25 percent by weight carbon, a portion of said carbon prior to subjecting said composition to curing at elevated temperatures being in the form of a liquid carbonaceous bonding resin. 
     
     
       2. A moldable refractory composition for making a compact refractory brick consisting essentially of about 80 percent by weight periclase, about 12 percent graphite and about 8 precent bonding resin. 
     
     
       3. A moldable refractory composition as set forth in claim 2 in which said bonding resin includes about 25 percent by weight dry phenolic powder and about 75 percent by weight phenol formaldehyde liquid bonding resin. 
     
     
       4. A moldable refractory composition as set forth in claim 2 in which said bonding resin consists of a phenolic liquid resin.